<template>
  <div>
    <div class="search">
      <input v-model="keyword" class="search-input" type="text" placeholder="请输入城市名或拼音">
    </div>
    <div
      class="search-content"
      ref="search"
      v-show="keyword"
    >
      <ul>
        <li
          class="search-item border-bottom"
          v-for="item of list"
          :key="item.id"
          @click="handleCityClick(item.name)"
        >
          {{item.name}}
        </li>
        <li class="search-item border-bottom" v-show="hasNoData">
          没有匹配数据
        </li>
      </ul>
    </div>
  </div>

</template>

<script>
  import Bscroll from 'better-scroll'
  import { mapMutations } from 'vuex'
  export default {
    name: "CitySearch",
    props:{
     cities:Object
    },
    data(){
      return{
        keyword:'',
        list:[],
        timer:null,
      }
    },
    computed:{
      hasNoData(){
        return !this.list.length
      }
    },
    watch:{ //监听keyword的改变
      keyword(){
        //节流函数，提高代码执行效率
        if(!this.keyword){
          this.list = []
          return
        }
        if(this.timer){
          clearTimeout(this.timer)
        }
        this.timer = setTimeout(() => {
          const result = []
          for (let i in this.cities){
            this.cities[i].forEach((value) => {
              if(value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1){
                result.push(value)
              }
            })
          }
          this.list = result
        },100)
      }
    },
    methods:{
      handleCityClick(city){
        this.changeCity(city)
        this.$router.push('/')
      },
      ...mapMutations(['changeCity'])
    },
    mounted(){
      this.scroll = new Bscroll(this.$refs.search)
    }
  }
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.search
  height:.72rem
  padding:0 .1rem
  background:$bgColor
  .search-input
    height:.62rem
    line-height:.62rem
    width: 100%
    padding: 0 .1rem
    box-sizing: border-box
    color:#666
    text-align:center
    border-radius:.06rem
.search-content
  position :absolute
  top:1.58rem
  left:0
  right:0
  bottom:0
  overflow :hidden
  background :#eee
  z-index:1
  .search-item
    line-height:.62rem
    padding-left:.2rem
    color:#666
    background:#fff


</style>
